湖北赤壁东洲大道工程边坡渐进破坏机理分析

东洲大道工程边坡处于褶皱断裂复合部位，是典型降雨和工程施工扰动引起的渐进变形破坏。本文在剖析其特殊边坡工程地质结构基础上，并建立边坡计算水文地质模型，提出了牵引式边坡稳定分析的部分强度折减不平衡拉力法，其稳定性分析结果表明：首次破坏是由于边坡开挖，表层植被被剥落，水沿着断层进入滑体，从而产生了推移式破坏；二次破坏是在首次破坏产生的临空面基础上，致使滑体产生了牵引式的破坏模式；且部分强度折减不平衡拉力法计算结果与现场破坏形式一致。本文在牵引式边坡不平衡拉力法计算的基础上，建立了牵引式边坡破坏后以残余强度整体推移式控制力的计算法，并提出了相应的控制措施，多年的控制措施运行结果表明：该治理效果良好。

Analysis of progressive failure mechanism of engineering slope at Dongzhou Avenue,Chibi of Hubei Province

The engineering slope of Dongzhou Avenue is located in the complex zone with folds and fractures, which is a typical form of progressive deformation failure caused by the rainfall and engineering construction. Based on the analysis of its special slope engineering geological structure, a hydro-geological model is established in this paper, an unbalanced tension method of partial strength reduction for the pull-type slope is proposed to analyze the safety factor. The results of stability analysis show that: a thrust-type failure happen at first under the conditions, which an excavation is carried out, the water enters the sliding body along the fault, and the surface vegetation is peeled off. The second failure is based on the free surface caused by the first failure, a pull-type failure mode occurs from the middle part to the trailing edge of the sliding body, the calculated results of the unbalanced tension method of partial strength reduction are consistent with the field failure form. In this paper, based on the calculation of the traction slope unbalanced tension method, the calculation method of the overall pushing type control force with residual strength after the traction slope damage is established, and the corresponding control measures are proposed, and the operation results of the control measures for many years show that the management effect is good.